FI126713B

FI126713B - Ventilation elements for windows and windows

Info

Publication number: FI126713B
Application number: FI20155016A
Authority: FI
Inventors: Tapio Tarpio
Original assignee: Air Termico Oy
Priority date: 2015-01-12
Filing date: 2015-01-12
Publication date: 2017-04-13
Also published as: FI20155016A

Description

Ventilation Element for a Window and a Window Field of the invention

The present invention relates to a ventilation element for a window and a window. The ventilation element comprises means for forming one or more air channels for providing supply air via the window. The window comprises at least two glasses (window panes) and an intermediate space between the glasses; an air inlet for receiving supply air; and an air outlet for outputting the supply air from the window.

Background of the invention

Controlled ventilation of buildings is, at present, more important than before, in view of e.g. habitability, energy saving, and preventing moisture from damaging structures. In many cases, buildings are equipped with an exhaust system for removing air from the rooms of the building and for conveying the removed air, for example, outdoors, either directly or via a heat recovery unit. Supply air, that is, replacement air, can be introduced into the rooms via replacement air valves and increasingly by means of supply air windows. Typically, in supply air windows, replacement air is introduced from atmospheric air by means of an inlet either directly to the building or via the supply air window. Supply air windows typically comprise a window frame and two or more glasses attached to window sashes. The window sashes may be attached to the frames by hinges to that the window sashes can be opened, if necessary. There is also a so called an intermediate space between the glasses. This intermediate space can be used to warm the supply air before leading it into the room. Especially in winter this may reduce the feeling of draft in the room because the incoming air is warmer compared to the situation in which the supply air comes directly from outside into the room. A drawback in supply air windows of prior art may be that some slits are needed in the window frame and possibly also in one or more of the window sashes. These slits are meant to form different routes for the supply air so that supply air may flow either directly from outside into a room (a so called summer position of the supply air window) or via the intermediate space (a so called winter position of the supply air window). A Finnish utility model FI-8788U discloses a supply air window, in which supply air may be led using two routes: a first route for summer time and a second route for winter time. There is a module which comprises a regulating element for regulating air flow either the first route or the second route. The module has an opening for the second route, wherein a corresponding opening needs to be formed to the window frame to enable air flowing into an intermediate space of the window in winter time. The construction also needs the regulating element which has two positions: one for summer time and another for winter time. Such a construction is complicated, requires extra work to form the opening to the window frame, and the regulating element should be very accurately formed to prevent air leaking through the regulating element.

Brief summary of the invention

It is an aim of the present invention to provide a ventilation element for a window and an improved supply air window so that the structure of the supply air window is simpler than prior art supply air windows. The ventilation element may also be called as a ventilation apparatus. The present invention is based on the idea of providing the ventilation element with a base part, which comprises at least an air inlet; a first air outlet; a second air outlet; a first filter; a second filter; and an air guide. To put it more precisely, the ventilation element according to the present invention is primarily characterized in that: the first air inlet comprises at least one opening in the first wall of the base part; the first air outlet comprises at least one opening in the second wall of the base part; the second air outlet is located between the first wall and the second wall; and a second filter at the first outlet, wherein the first wall and the second wall are parallel to each other; the first wall and the second wall are connected with each other at a first edge of the first wall and the second wall by a top wall; and the space between the first wall and the second wall at a second edge of the first wall and the second wall defines the second air outlet.

The window according to the present invention comprises: a first sash for a first window pane; a second sash for a second window pane; and the ventilation element of any of the claims 1 to 2.

Some example embodiments are defined in the dependent claims.

The present invention shows some advantages over solutions of prior art. When applying the ventilation element according to the invention, it is possible to obtain the supply air window which is simpler than prior art supply air windows and less cutting of slots are needed. In some embodiments there is no need to make the slots at all but appropriate routes for supply air may be achieved by leaving some parts of the window sashes without gaskets.

Description of the drawings

In the following, the present invention will be described in more detail with reference to the appended drawings, in which

Fig. 1a shows a side view of an example of a ventilation element according to an embodiment of the invention;

Fig. 1b shows a top view of the ventilation element according to an embodiment of the invention;

Fig. 1c shows a bottom view of the ventilation element according to an embodiment of the invention;

Fig. 1d shows another side view of an example of a ventilation element according to an embodiment of the invention;

Fig. 1e shows a cross-sectional view of the ventilation element in the direction A-A of Fig. 1a;

Fig. 2 shows a perspective view of the ventilation element of Figs. 1a— 1e without filters installed;

Fig. 3a shows the supply air window according to an embodiment in a first operational condition, in a cross-sectional view;

Fig. 3b shows the supply air window according to a first embodiment in a second operational condition, in a cross-sectional view;

Fig. 3c shows an embodiment of a window having two ventilation elements;

Fig. 4a depicts a cross section of an air guide according to another example embodiment;

Fig. 4b depicts the air guide of Fig. 4a as a top view;

Fig. 4c depicts an example of a control plate of the air guide of Fig. 4a; and

Fig. 5 depicts an example of a supply air window in which the air guide of Figs. 4a to 4c is used.

Detailed description of the invention

Figures 1a—1d show side, top and bottom views of an example of a ventilation element 1 according to an advantageous embodiment of the invention, and Fig. 2a shows a perspective view of the ventilation element of according to Figs. 1a—1e without filters installed. In this embodiment the ventilation element 1 comprises a base part 2, an air guide 3, a first filter 4 and a second filter 5. Fig. 1b shows a perspective view of the base part 2 of the ventilation element of Figure 1a cut at the location A-A. The base part 2 has a first wall 2a, a second wall 2b substantially opposite to the first wall 2a, and a third wall 2c connecting the first wall 2a and the second wall 2b preferably at one edge of the first wall 2a and the second wall 2b. Hence, the cross section of the base part 2 resembles a U form. In this embodiment the base part 2 also has a first end wall 2d at one end of the base part 2, and a second end wall 2e at the other end of the base part 2. One purpose of the end walls 2d, 2e is to prevent air flow through the ends of the base part 2. The end walls 2d, 2e may also make the structure of the base part 2 mechanically stronger. In this example embodiment the base part 2 is also provided with fixing elements 6 at both ends of the base part 2. The purpose of the fixing elements 6 is to attach the ventilation element 1 to a window frame 13 (Figure 3a) and to keep the base part 2 at a correct position inside the window 14 so that an air flow is enabled from a slat 19, which is between the window frame 13 and a first window sash 17, to an air inlet 10 of the base part 2. formed from a the window frame and the base part 2 when the ventilation element 1 is attached with the window frame. Figures 3a and 3b illustrate some examples of this.

The first wall 2a of the base part 2 is provided with an air inlet 10 enabling fresh air from outside the room to enter the ventilation element 1. In the embodiment of Figures 1a and 1b the air inlet 10 comprises two openings 10a, 10b, but the air inlet 10 may also be implemented in another appropriate way, for example as only one opening 10a. The size of the one or more openings 10a, 10b is preferably such that the cross section of the opening(s) is large enough for ventilation purposes. In other words, the amount of air flowing through the opening(s) should be adequate to keep the interior of the room fresh. In some instructions for ventilation designers it is recommended that the turnover rate of the air in a room should be at least once in two hours. This means that volume of the air flowing through the air inlet 10 in two hours should be at least the same than the volume of the room.

The second wall 2b of the base part 2 is provided with a first air outlet 11 enabling a part of the fresh air which has entered the ventilation element 1 to flow outside the ventilation element 1. In the embodiment of Figures 1a and 1b also the air outlet 10 comprises two openings 11a, 11b, but the first air outlet 11 may also be implemented in another appropriate way, for example as only one opening 11a. The size of the one or more openings 1aa, 11b may be substantially the same than the size of the opening(s) 10a, 10b of the air inlet 10, but it may also be different from that.

The base part 2 has a second air outlet 12, which may be implemented e.g. as an opening between the first wall 2a and the second wall 2b, opposite to the third wall 2c. This part of the base part 2 may be called as a bottom, because when the ventilation element 1 is attached with a window frame, the second air outlet 12 is located at the lowest part of the base part 2. Some or all of the air which has entered the ventilation element 1 may exit the ventilation element through the second air outlet 12. This will be explained later in this specification.

The ventilation element 1 may be provided with one or more filters 4, 5 as was mentioned above. A purpose of the filters 4, 5 is to at least partly remove impurities which the air flow entering the ventilation element 1 may carry with. The filters 4, 5 may further improve sound absorbing properties of the ventilation element 1. The filters 4, 5 may be so called electro-static filters wherein they may be able to attract impurities from the air even if the air is not flowing through the filter(s) 4, 5.

The fixing elements 6 at both ends of the base part 2 may be magnets or some other kind of fixing elements, such as holes for screws, for example. When using magnets as the fixing elements 6, a metallic sheet 13 may be used which attracts the magnets. The metallic sheet 13 may be installed e.g. on the frame of the window, near the outermost sash of the window. Hence, the ventilation element 1 may be put on the surface of the metallic sheet 13, wherein the force induced by the magnets towards the metallic sheet 13 keep the ventilation element 1 pressed against the metallic sheet 13 and thus enables secure enough attachment of the ventilation element 1 to the window frame at a correct position. In addition to or instead of magnets, it may, however, be possible to use screws, double sided tape, glue or other appropriate method for the attachment. When using magnets, double sided tape etc. materials the attachment and detachment of the ventilation element 1 may be performed without using tools, wherein it may be easier and faster to e.g. change the filter(s) 4, 5 when necessary.

The air guide 3 is provided near the air inlet 10 so that air flowing through the air inlet 10 is forced at some extent to turn towards the second outlet 12 located at the bottom of the base part 2. The cross section of the air guide 3 may be curved or straight or partly curved and partly curved. In the example of Figure 1b the air guide 3 is convex with reference to the incoming air, but may also be concave, which may provide stronger directional effect downwards to the incoming air. However, it may not always be preferable to maximize the downwards directional force but somehow weaker force so that at least a part of the incoming air may flow towards the first outlet 10 instead of flowing towards the second outlet 12, as will be described later in this specification.

Figures 3a and 3b show as a cross sectional view the ventilation element 1 according to Fig. 1a attached to a frame 13 of a window 14. Fresh air from outside, which may also be called as supply air, may enter the window 14 via an air inlet 19 (illustrated with arrow F1 in Figure 3a), which may be formed e.g. by leaving a part of the space between the upper most part of the window frame 13 and the upper most part of a first sash 17 of the first (outermost) window pane 17a without a gasket. Hence, an inlet air channel exists from the outside into the intermediate space 22 of the window 14. The intermediate space 22 means in this specification the space which is limited by the outermost window pane 17a, the sash 17 of the outermost window pane 17a, the innermost window pane 18a, the sash 18 of the innermost window pane, and the window frame 13 which surrounds the window sashes 17, 18. The window 14 may comprise an outlet air channel 20 for leading air from the intermediate space 22 to the room. The outlet air channel 20 may be formed e.g. by cutting a slit through the sash 18 of the innermost window 18a. The supply air window may also comprise an air guiding element 24 on the surface of the sash 18 so that supply air which flows through the outlet air channel 20 is directed upwards and also possible sidewards (arrow F6). In other words, the air guiding element 24 may vertically and/or horizontally deviate the flow of the incoming supply air.

In the following, the operation of the ventilation element 1 will be described in more detail with reference to Figures 3a and 3b, in accordance with an embodiment. Figure 3a illustrates the operation of the ventilation element 1 when the temperature of the outside air is about the same than the temperature of the air inside the room 21. This may also be called as a summer condition. For example, the outside air temperature may be much above 0°C, e.g. somewhere between +10°C and +40°C. Figure 3b illustrates the operation of the ventilation element 1 when the temperature of the outside air is significantly lower than the temperature of the air inside the room 21. For example, the outside air temperature may be below 10°C or even below 0°C, e.g. somewhere between 10°C and -40°C. This may also be called as a winter condition. The room temperature may be just above 20°C, such as between 21 °C and 24°C.

The ventilation element 1 is attached with the window frame, as is depicted in Figures 3a and 3b. There is a gap (slit) between the upper side of the outermost window sash 17 and the window frame 13 so that air can flow via the gap and through the first air inlet 10 from outside into the ventilation element 1. This is indicated with the arrow F1 in Figure 3a. It is now assumed that the outside air temperature is about the same than the room temperature. The air temperature inside the window may also be substantially the same or may be higher, e.g. when the Sun shines to the window and warms up the air inside the window. Due to this, the air inside the window tends to rise towards the upper part of the window (arrows F2). Hence, it causes an uplift pressure inside the window. Hence, the air flowing into the ventilation element 1 is affected by this force and the air may turn towards the first air outlet 10 and only a small part, if any, of the incoming air enters the second outlet 12. Thus, the possibly warmer air inside the window may not be mixed with the fresh air coming from outside and the temperature of the room may not be significantly affected by the warmer air. This is illustrated with the arrow F3 in Figure 3a. Air which exits the ventilation element 1 may then flow at the upper part of the intermediate space of the window towards gap between the innermost window sash 18 and the window frame13.

In a situation when the outside air temperature is significantly lower than the room temperature, air flowing inside the ventilation element 1 may behave as follows (Figure 3b). Due to the lower outside temperature also the temperature of the outermost window pane may be lower than the room temperature. This phenomenon may cause an air flow downwards, inside the window on the surface of the window pane. Hence, the air tends to flow through the first filter 4 and exit the ventilation element via the second air outlet 12. This is illustrated with the arrow F4 in Figure 3b. In other words, the low surface temperature of the outermost window pane 17a induces a draft to the air wherein a great amount of the incoming air flows follows this route and does not directly enter the channel 20. Especially in winter time in certain areas of the globe the outside temperature may often be below 5 degrees Celsius or even below 0 degrees Celsius, wherein the above behaviour of the supply air may be quite probable. On the other hand, when the outside air temperature is higher than the above mentioned values, most of the supply air may flow directly through the second filter 5 without flowing through the first filter 4. In practical situations it may happen that a minor part of the air may exit the ventilation element 1 via the first air outlet 11. Because the majority of air flows downwards and through the second air outlet 12, it continues to flow further downwards near the surface of the outer window pane until it begins to turn upwards. This is illustrated with the arrow F5 in Figure 3b. Air flowing inside the window may also warm up, because the temperature inside the window may be higher than the outside temperature e.g. because the window panes may conduct some heat from the room into the window. A part of this heat is thus convected back to the room by the incoming air.

In this specification the terms first window sash, first window pane, outermost window sash and outermost window pane mean the window sash and window pane which are facing the atmosphere (the outside of the room). Respectively, the terms innermost window sash and innermost window pane mean the window sash and window pane which are facing the room. A window may also comprise one or more intermediate window sashes and window panes between the outermost and innermost window sashes and window panes. In such windows the air may be arranged to circumvent the intermediate window pane from under, i.e. the air may flow downwards between the outermost window pane 17a and the intermediate window pane, and then flow upwards on the other side of the intermediate window pane and further through the air channel 20. It may also be possible that the air may be arranged to circumvent the intermediate window pane from above and/or from the sides of the intermediate window pane(s).

It should also be noted that one window pane may consist one or more glasses arranged together as one window element.

Figures 3a, 3b and 5 also depict an attaching plate 30 which may be used to attach the ventilation element 1 with the window frame 13. The attaching plate 30 may be fixed e.g. by screws to the window frame 13, wherein the magnets 6 of the ventilation element may induce an attaching force to the attaching plate 30 and keeps the ventilation element 1 in place. However, the attaching plate 30 may be fixed to the window frame 13 by other means as well, e.g. by a double-sided adhesive.

The air channel 20 may be achieved e.g. by leaving a part of the space between the upper most part of the window frame 13 and the upper most part of the sash 18 of the innermost window pane 18a without a gasket. Hence, the air channel 20 exists which may lead supply air from the intermediate space 22 of the window 14 into the room 23. In another embodiment the sash 18 of the innermost window may be provided with a slit which forms the air channel 20. It is also possible that the air channel 20 is provided with a filter (not shown) to filter out possible impurities from the air flowing into the room 23 via the air channel 20.

Figures 4a to 4c and 5 depict an example of the air guide 9 which may be used with the air supply window of Figures 3a and 3b. The air guide 9 may be fixed on the surface of the window frame 13, just above the window sash 18. Hence, supply air which exits the air channel 20 can flow through the aperture 40 of the air guide 9 and into the room. The air guide 9 may also comprise a guiding wall 41 which turns the direction of the supply air at least partly upwards towards a ceiling of the room (not shown) and possibly sidewards. The surface of the guiding wall 41 may be provided with a condensing preventer 45 which reduces the risk that humidity could condense into water on the surface of the guiding wall 41. The air guide 9 may further comprise a backflow trap 43 which prevents or at least reduces the risk of air flowing from the room into the supply air window i.e. in a reversed direction.

This kind of risk could occur if the pressure inside the room were greater than the pressure in the supply air window 14. The air guide 9 may further comprise a control plate 44 which may be used to control the amount of supply air coming via the supply air window. The control plate 44 may be pushed towards the window sash 18 to reduce the amount of the flow of the supply air, and the control plate 44 may be pulled farther from the window sash 18 to increase the amount of the flow of the supply air.

Figure 4a depicts a cross section of the air guide 9, Figure 4b depicts the air guide as a top view, and Figure 4c depicts an example of a control plate 44 and Figure 5 depicts as a cross sectional view the supply air window in which the air guide 9 of Figures 4a—4c is used.

In an embodiment the control plate 44 may be attached with a magnetic tape or some other kind of magnetic material. Hence, if the bottom of the air guide comprises metal or some other material which may induce generation of forces between the control plate 44 and the magnetic material. Hence, the control plate 44 may be moved to a desired position and it remains in that position due the generated forces. However, the strength of such forces is usually at a level which enable intentional movement of the control plate 44 to another position by a user. By this arrangement the adjustment of the air flow can be made quite easily.

The filters 4, 5 and the base part 2 may be designed in such a way that the first filter 4 is supported by the fist wall 2a and the second wall 2b of the base part 2 and/or there may be a support at both ends 2d, 2e of the base part 2, wherein the first filter 4 may rest on the supports. The second filter 5 may be positioned in front of the first outlet 11, inside the base part 2. This is illustrated in Figure 1e. In practice, however, it may be necessary to install the second filter 5 before installing the first filter 4, wherein uninstallation, e.g. to replace used filters 4, 5 with new ones, may be performed the other way around. The height of second filter 5 and the thickness of the first filter 4 may be such that the sum of the height of second filter 5 and the thickness of the first filter 4 is equal to or slightly less than the height of the first wall 2a and the second wall 2b of the base part 2, as can be seen from Figure 1e.

The filters 4, 5 may be electrostatic filters or other filters suitable for filtering impurities from incoming air without causing too high resistance for the air flow.

The base part 2 may be manufactured of a plate like piece of steel (e.g. by punching), plastic or other suitable material, or it may be formed in a melt, or printed by a 3D-printer.

In an embodiment the window 14 may comprise another ventilation element T for the outlet air channel 20 (Figure 3c). However, the other ventilation element T should be installed so that the air inlet 10 is towards the sash 18 of the innermost window pane. In other words, the air inlet 10 of the other ventilation element T operates as an air outlet, and the first air outlet 11 and the second air outlet 12 operate as air inlets of the other ventilation element r.

The length of the ventilation element 1 may be selected so that it fits inside the intermediate space 22 and enables to achieve adequate cross sectional area for supply air flows. Some non-limiting example values for the length of the ventilation element 1 (and the base part 2) are 400 mm, 460 mm, 600 mm, 660 mm, 800 mm, 860 mm, 1000 mm, 1060 mm, etc. Some nonlimiting example values for the size of the cross section of the ventilation element 1 (and the base part 2) are 20 mm x 20 mm, 25 mm x 25 mm, 20 mm x 25 mm, 25 mm x 20 mm, 30 mm x 30 mm, 20 mm x 30 mm, 30 mm x 20 mm, etc.

The present invention is not limited to the above-presented embodiments, but it can be modified within the scope of the appended claims.

Claims

1. Ilmanvaihtoelementti (1) ikkunaa (14) varten, joka ilmanvaihtoelementti käsittää runko-osan (2), ensimmäisen ilman sisäänottoyhteen (10), ensimmäisen ilmanpoistoyhteen (11), toisen ilmanpoistoyhteen (12), sekä toisen ilmanpoistoyhteen (12) yhteydessä olevan ensimmäisen suodattimen (4), jolloin runko-osa (2) käsittää ainakin ensimmäisen seinämän (2a), sekä etäisyyden päässä ensimmäisestä seinämästä (2a) olevan toisen seinämän (2b), tunnettu siitä, että ensimmäinen ilman sisäänottoyhde (10) käsittää runko-osan (2) ensimmäisessä seinämässä (2a) olevan ainakin yhden aukon (10a, 10b), ensimmäinen ilmanpoistoyhde (11) käsittää runko-osan (2) toisessa seinämässä (2a) olevan ainakin yhden aukon (11a, 11b), toinen ilmanpoistoyhde (12) sijaitsee ensimmäisen seinämän (2a) ja toisen seinämän (2b) välissä, ja ensimmäisen ilmanpoistoyhteen (11) yhteydessä toisen suodattimen (5), jolloin ensimmäinen seinämä (2a) ja toinen seinämä (2b) ovat keskenään yhdensuuntaiset, ensimmäinen seinämä (2a) ja toinen seinämä (2b) on liitetty toisiinsa ensimmäisen seinämän (2a) ja toisen seinämän (2b) ensimmäisestä reunasta yläseinämän (2c) avulla, ja ensimmäisen seinämän (2a) ja toisen seinämän (2b) välinen tila ensimmäisen seinämän (2a) ja toisen seinämän (2b) toisen reunan kohdalla rajaa toisen ilmanpoistoyhteen (12).A ventilation element (1) for a window (14), the ventilation element comprising a frame (2), a first air inlet (10), a first air outlet (11), a second air outlet (12), and a first air outlet (12). filter (4), wherein the body (2) comprises at least a first wall (2a) and a second wall (2b) at a distance from the first wall (2a), characterized in that the first air inlet connection (10) comprises a body (2) 2) at least one opening (10a, 10b) in the first wall (2a), the first vent (11) comprising at least one opening (11a, 11b) in the second wall (2a) of the body (2), the second vent (12) being located between the first wall (2a) and the second wall (2b), and in connection with the first deaeration connection (11), a second filter (5), the first wall (2a) and the second wall (2a) 2b) are parallel to one another, the first wall (2a) and the second wall (2b) being interconnected from the first edge of the first wall (2a) and the second wall (2b) by the top wall (2c), and the first wall (2a) and the second wall (2b) ) at the second edge of the first wall (2a) and the second wall (2b) delimits the second vent (12).

2. Patenttivaatimukseni mukainen ilmanvaihtoelementti (1), tunnettu siitä, että ilmanvaihtoelementti (1) käsittää ainakin yhden kiinnityselementin (6) ilmanvaihtoelementin (1) kiinnittämiseksi ikkunan karmiin (13).Ventilation element (1) according to claim 1, characterized in that the ventilation element (1) comprises at least one fastening element (6) for securing the ventilation element (1) to the window frame (13).

3. Ikkuna (14), joka käsittää ainakin: ensimmäisen puitteen (17) ensimmäistä ikkunaruutua (17a) varten; toisen puitteen (18) toista ikkunaruutua (18a) varten; ensimmäisen ikkunaruudun (17a) ja toisen ikkunaruudun (18a) välissä olevan välitilan (22), ja ensimmäisen puitteen (17) ja toisen puitteen (18) välissä olevan, jonkin patenttivaatimuksen 1-2 mukaisen ilmanvaihtoelementin (1).A window (14) comprising at least: a first frame (17) for a first window pane (17a); a second frame (18) for the second window pane (18a); an intermediate space (22) between the first window pane (17a) and the second window pane (18a), and a ventilation element (1) according to any one of claims 1 to 2 between the first frame (17) and the second frame (18).

4. Patenttivaatimuksen 3 mukainen ikkuna (14), tunnettu siitä, että ikkuna (14) käsittää: ilman sisäänottoyhteen (19) tuloilman vastaanottamiseksi ikkunaan (14), ja ilmanpoistokanavan (20) tuloilman johtamiseksi pois ikkunasta (14), jolloin ilmanvaihtoelementti (1) on sovitettu ohjaamaan tuloilman virtausta ilman sisäänottoyhteestä (19) ilmanpoistokanavaan (20) joko suoraan ilman sisäänottoyhteestä (19) ilmanpoistokanavaan (20) ensimmäisen ilman sisäänottoyhteen (10) ja ensimmäisen ilmanpoistoyhteen (11) kautta tai ainakin osittain ensimmäisen ilman sisäänottoyhteen (10) ja toisen ilmanpoistoyhteen (12) kautta.Window (14) according to claim 3, characterized in that the window (14) comprises: an air inlet (19) for receiving the supply air to the window (14), and an air outlet (20) for directing the supply air out of the window (14); is adapted to direct the supply air flow from the air inlet (19) to the air outlet (20) either directly from the air inlet (19) to the air outlet (20) through the first air inlet (10) and the first air inlet (10) or at least partially (12).

5. Patenttivaatimuksen 4 mukainen ikkuna (14), tunnettu siitä, että ikkuna (14) käsittää lisäksi ilmanohjaimen (9) ilmanpoistokanavasta (20) lähtevän tuloilmavirtauksen suunnan ohjaamiseksi.Window (14) according to claim 4, characterized in that the window (14) further comprises an air deflector (9) for controlling the direction of the supply air flow from the air outlet duct (20).

6. Patenttivaatimuksen 5 mukainen ikkuna (14), tunnettu siitä, että ilman-ohjain (9) käsittää säätölevyn (44), joka on sovitettu säätämään ilmanpoistokanavasta (20) lähtevän tuloilman virtausta.Window (14) according to Claim 5, characterized in that the air deflector (9) comprises a baffle plate (44) adapted to control the flow of supply air from the deaeration channel (20).